This commit fixes an issue where the post view would scroll to the text
cursor at seemingly random times.
This was done by detaching the save view and its logic, so that we have
3 components:
1. The `PostView`
2. An auto-save view model (which is an Observable object)
3. A separate SwiftUI view for the auto-save indicator
The auto-save view model is shared between the `PostView` and the new
indicator view to ensure proper signaling and communication across
views.
However, this view model is only observed by the indicator view,
ensuring it updates its own view, while not causing any re-renders on
the rest of the `PostView`.
This refactor had the side-effect of making the auto-save logic and view
more reusable. It is now a separate collection of elements that can be
used anywhere else.
Beyond the scroll issue, this commit also prevents empty drafts from
being saved, by introducing the new save state called `.nothingToSave`
Note: No changelog item is needed because the new drafts feature was never
publicly released.
Changelog-None
Closes: https://github.com/damus-io/damus/issues/2826
Signed-off-by: Daniel D’Aquino <daniel@daquino.me>
0111c5e2dc